AC compressor not starting — Chicago, Illinois
When the outdoor AC unit hums, clicks, or stays completely silent while the indoor fan blows warm air, the compressor likely isn't starting. Common causes include a failed capacitor, a burned-out compressor motor, a tripped high-pressure switch, or low refrigerant levels. The compressor is the most expensive component in the system — running a failing one can cause total unit failure. An HVAC technician can diagnose whether the fix is a $150 capacitor swap or a compressor replacement that may justify upgrading the entire system.
Waarom dit veel voorkomt in Chicago
Lake effect weather creates extreme temperature swings — from -20°F winters to 95°F+ summers — meaning both heating and cooling systems work year-round. Furnace failures during polar vortex events are emergency situations, and many Chicago homes rely on aging boiler systems.
Who to call
For this problem in Chicago, call a: Klimaattechnicus
Vind een Klimaattechnicus in ChicagoSymptoms to look for
- The outdoor unit hums or clicks but the fan doesn't spin and no cold air comes out
- The indoor blower runs normally but only pushes warm air
- The outdoor unit is completely silent — no fan, no compressor sound
- The circuit breaker for the AC unit trips repeatedly
- A clicking sound from the outdoor unit every few minutes as the compressor tries and fails to start
Spoeddienst in Chicago
Emergency home services in Chicago are widely available 24/7, with typical response times of 30–60 minutes. After-hours rates range from $100–$200/hour. During polar vortex events, heating emergencies can see delays of 4–8 hours due to overwhelming demand. Illinois requires plumbing and electrical licenses for all work.